Hosea 1:10

Yet the number of the (m) children of Israel shall be as the sand of the sea, which cannot be measured nor numbered; and it shall come to pass, [that] in the place where it was said unto them, Ye [are] not my people, [there] it shall be said unto them, [Ye are] the sons of the living God.

(m) Because they thought that God could not have been true in his promise unless he had preserved them, he declares that though they were destroyed, yet the true Israelites who are the sons of the promise, would be without number, who consist both of the Jews and the Gentiles; (Romans 9:26).